Reading attribute of an XML file

Question

I have this XML file, I can read all the the nodes

<?xml version="1.0" encoding="UTF-8"?>
<cteProc xmlns="http://www.portalfiscal.inf.br/cte" versao="1.04">
    <CTe xmlns="http://www.portalfiscal.inf.br/cte">
        <infCte versao="1.04" ID="CTe3512110414557000014604"></infCte>
    </CTe>
</cteProc>

I have tried reading this using C#

string chavecte;        
string CaminhoDoArquivo = @"C:\Separados\13512004-procCTe.xml";
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(CaminhoDoArquivo); //Carregando o arquivo
chavecte = xmlDoc.SelectSingleNode("infCTe")
                    .Attributes.GetNamedItem("Id").ToString();

but something is wrong with this code.

possible duplicate of [Using Xpath With Default Namespace in C#](http://stackoverflow.com/questions/585812/using-xpath-with-default-namespace-in-c-sharp) - most likely reason is lack of using namespaces in selecting "infCte" node as covered in this question. — Alexei Levenkov, Jan 02 '13 at 19:15

score 4 · Answer 1 · answered Jan 02 '13 at 19:20

4

If you want to use Linq To Xml

var xDoc = XDocument.Load(CaminhoDoArquivo);
XNamespace ns = "http://www.portalfiscal.inf.br/cte";
var chavecte = xDoc.Descendants(ns+"infCte").First().Attribute("id").Value;

PS: I am assuming your xml's invalid line is as

<infCte versao="1.04" id="CTe3512110414557000014604"></infCte>

answered Jan 02 '13 at 19:20

I4V

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Thanks the code work perfect. I have write wrong , i forget "id" – alejandro carnero Jan 02 '13 at 19:39
+1. For correct answer and especially for magically knowing that @alejandrocarnero does not care about what XML parsing classes to use. – Alexei Levenkov Jan 02 '13 at 19:51

Sam I am says Reinstate Monica · Answer 2 · 2013-01-02T20:09:16.017

2

replace

chavecte = xmlDoc.SelectSingleNode("infCTe").Attributes.GetNamedItem("Id").Value;

with

XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);
nsmgr.AddNamespace("ab", "http://www.portalfiscal.inf.br/cte");

chavecte = xmlDoc.SelectSingleNode("//ab:infCte", nsmgr)
                 .Attributes.GetNamedItem("Id").Value;

I've also noticed that infCte doesn't have the ID attribute properly defined in your xml

edited Jan 02 '13 at 20:09

answered Jan 02 '13 at 19:12

Sam I am says Reinstate Monica

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1

It is unlikely to help since XPath to the "infCte" node does not include "http://www.portalfiscal.inf.br/cte" namespace. – Alexei Levenkov Jan 02 '13 at 19:17
@AlexeiLevenkov, sorry, when some people tell you "it doesn't work" it's sometimes hard to find all the reasons. I'll look at that and then edit as appropriate – Sam I am says Reinstate Monica Jan 02 '13 at 19:18

score 0 · Answer 3 · answered Sep 16 '13 at 18:42

Another possible solution is:

string CaminhoDoArquivo = @"C:\Separados\13512004-procCTe.xml";
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(CaminhoDoArquivo); //Carregando o arquivo

// Select the node you're interested in
XmlNode node = xmlDoc.SelectSingleNode("/cteProc/CTe/infCte");
// Read the value of the attribute "ID" of that node
string chavecte = node.Attributes["ID"].Value;

Reading attribute of an XML file

3 Answers3